USING (Namespaces)

Brings namespace symbols into the current scope

Using identifier [, identifier [, ...] ]

identifier: The name of the Namespace that you want to use.

The Using command allows all symbols from a given namespace to be accessed without the namespace's name prefix. Unlike C++ but like C#, the Namespace keyword is not needed after Using, because individual symbols cannot be inherited from a namespace.
Inheriting a whole namespace can save typing, but sometimes some meaning of the code can be lost, and conflicts with other symbols could be created. For example, if there is duplicated symbol in the global namespace (unnamed namespace), access to local symbol is captured by duplicated global symbol (in that case, full prefixing is required to access local symbol).

Namespace Sample
    Type T
        x As Integer
    End Type
End Namespace

'' Just using the name T would not find the symbol,
'' because it is inside a namespace.
Dim SomeVariable As Sample.T

'' Now the whole namespace has been inherited into
'' the global namespace.
Using Sample

'' This statement is valid now, since T exists
'' without the "Sample." prefix.
Dim OtherVariable As T

Differences from QB:
See also:
Back to Modularizing
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